Wind turbine noise reduction with acoustically absorbent serrations

A wind turbine blade comprising:

• a trailing edge comprising:
• a radially inboard portion;
• a radially outboard portion opposite the radially inboard portion;
• and
• a retrofit system coupled to the trailing edge, the retrofit system comprising:
• a mounting structure for coupling the retrofit system to the trailing edge, the mounting structure extending at least partially between the radially inboard portion and the radially outboard portion, wherein the mounting structure comprises a substantially rectangular plate;
• and
• at least one serrated portion extending at least partially along the mounting structure, the at least one serrated portion comprising a base portion and a plurality of tip portions defining a serrated edge, the at least one serrated portion extending from the base portion to the plurality of tip portions in a direction away from the trailing edge, the at least one serrated portion comprising at least one substantially acoustically absorbent material.

A method for reducing noise emission from a wind turbine blade, the wind turbine blade including a trailing edge, the method comprising:

• providing a wind turbine noise abatement device including a mounting structure comprising a substantially rectangular plate and at least one serrated portion including at least one substantially acoustically absorbent material, the at least one serrated portion extending at least partially along the mounting structure, the at least one serrated portion comprising a base portion and a plurality of tip portions defining a serrated edge, the at least one serrated portion extending from the base portion to the plurality of tip portions in a direction away from the trailing;
• preparing the trailing edge to receive the mounting structure;
• and
• coupling the mounting structure to the trailing edge.